ABSTRACT

Polybenzoxaines nanocomposites with low-k and UV shielding behaviour have been developed using a new bis(quinoline amine), cardanol and biosilica. The new bis(quinoline amine) was synthesized through acid catalysed Friedlander reaction and its molecular structure has been confirmed using FT-IR and ¹H NMR. The bio-benzoxazine (C-bqa) was synthesised using cardanol, bis(quinoline amine) and paraformaldehyde at appropriate experimental conditions, and its molecular structure was confirmed from spectral analysis. Cardanol-based polybenzoxazine was reinforced with varying weight percentages of (5, 10, 15 wt%) of 3-glycidoxypropyltrimethoxysilane (GPTMS) functionalized bio-silica and were characterized using DSC, TGA, XRD, SEM and TEM. From the DSC analysis, it was observed that an exothermic peak maxima representing the ring opening polymerisation (curing) temperature of both neat cardanol based benzoxazine and 15 wt% of bio-silica reinforced cardanol-based benzoxazine composites are observed at 206°C and 216°C, respectively. The value of water contact angle of poly(C-bqa) was enhanced according to the increasing weight percentage of bio-silica reinforcement and the values observed for poly(C-bqa) matrix and 15 wt% of bio-silica reinforced poly(C-bqa) composites are 92° and 124° respectively. The values of dielectric constant obtained for neat poly(C-bqa) matrix and 15 wt% bio-silica reinforced poly(C-bqa) composites are 4.3 and 2.3 respectively. The UV shielding behaviour of bio-silica reinforced polybenzoxazine composites was also studied by UV-Vis spectroscopy technique and the results obtained infer that these materials possess good UV shielding behaviour.

摘要

使用新的双（喹啉胺）、腰果酚和生物二氧化硅开发了具有低 k 和紫外线屏蔽行为的聚苯并恶烷纳米复合材料。新的双（喹啉胺）是通过酸催化的弗里德兰德反应合成的，其分子结构已通过 FT-IR 和¹核磁共振。使用腰果酚、双（喹啉胺）和多聚甲醛在适当的实验条件下合成了生物苯并恶嗪（C-bqa），并通过光谱分析证实了其分子结构。腰果酚基聚苯并恶嗪用不同重量百分比 (5, 10, 15 wt%) 的 3-环氧丙氧基丙基三甲氧基硅烷 (GPTMS) 官能化生物二氧化硅增强，并使用 DSC、TGA、XRD、SEM 和 TEM 进行表征。从 DSC 分析中观察到，在 206°C 和 216°C 观察到代表纯腰果酚基苯并恶嗪和 15 wt% 生物二氧化硅增强腰果酚基苯并恶嗪复合材料的开环聚合（固化）温度的放热峰最大值℃，分别。聚 (C-bqa) 的水接触角值随着生物二氧化硅增强材料重量百分比的增加以及聚 (C-bqa) 基质和 15 wt% 的生物二氧化硅增强聚 (C -bqa) 复合材料分别为 92° 和 124°。纯聚 (C-bqa) 基体和 15 wt% 生物二氧化硅增强聚 (C-bqa) 复合材料的介电常数值分别为 4.3 和 2.3。还通过紫外-可见光谱技术研究了生物二氧化硅增强的聚苯并恶嗪复合材料的紫外屏蔽性能，所得结果表明这些材料具有良好的紫外屏蔽性能。纯聚 (C-bqa) 基体和 15 wt% 生物二氧化硅增强聚 (C-bqa) 复合材料的介电常数值分别为 4.3 和 2.3。还通过紫外-可见光谱技术研究了生物二氧化硅增强的聚苯并恶嗪复合材料的紫外屏蔽性能，所得结果表明这些材料具有良好的紫外屏蔽性能。纯聚 (C-bqa) 基体和 15 wt% 生物二氧化硅增强聚 (C-bqa) 复合材料的介电常数值分别为 4.3 和 2.3。还通过紫外-可见光谱技术研究了生物二氧化硅增强的聚苯并恶嗪复合材料的紫外屏蔽性能，所得结果表明这些材料具有良好的紫外屏蔽性能。